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The term "grunt" is used in the military as a general term for someone who's MOS (Military Occupational Specialty) is "Infantry". In the Marine Corps all MOS' preceeded by the number "03" are Infantry. About as "grunt" as you can get in the Corps is "0311 - Basic Rifleman".

The opposite of a "grunt" is a "pougue", which is a derogatory reference to pretty much anyone who isn't a grunt, but normally reserved for Marines who work in an office or some other rear-echelon job as part of their regular duties ("In the rear with the gear"). Call a pougue a "grunt" and they love it, but call a grunt a "pougue" and see what happens :-)

"If you ain't a grunt you ain't SHIT"

"The grunts at Phase Line Echo report multiple hostiles, scattered small-arms fire and are currently engaging."

"The fuckin' grunts always come to our E-Club and start shit."
by USMCG_Spyder January 01, 2006
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2
Term of affection for that tired, filthy, thirsty, hungry, footsore, ripped-trouser, camouflage-painted, lean, mean, son a b*itch who has kept the wolf away from the door for over two hundred years.

US Marines - (03--)
US Army - (11-)
Grunts do it better!

Those fuckin' grunts are cocky.
by Marine Infantry March 07, 2012
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3
Marines or other military serviceman who serve in the frontlines of war
Those fuckin grunts take all the action
by Foomanala April 26, 2007
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Grunt is an acronym used during WW2 for troops who had no formal training, or skills. G-general, R-replacement, UNT-untrained,...GRUNT, as they had no special training, they were given rifles and sent to the front.
Grunts do all the fighting.
by Paul Manning August 06, 2003
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5
The warriors on the battle field, the men in the shit. The ground re-enforcement unit for any armed forces.
There is no higher honor than being a grunt in the Marine Corps infantry
by _____ January 04, 2004
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6
A guttural noise made for several different circumstances: happy, sad, yes, no, oh yes, oh god yes, during sex, taking a shit
GRUNT ooooo yeah

GRUNT - ah man

<wife> Are you gonna take out the trash?
<husband> GRUNT
by Dave February 21, 2003
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7
Those annoying little fucks in Halo.
Try not to waste your shotgun ammo on Grunts. They're not worth it.
by Kevin Martin May 07, 2004
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